At one time it was thought(still is?) that we live in a closed universe?(adsbygoogle = window.adsbygoogle || []).push({});

So if we live in a closed universe we might try to get a picture of this space by thinking of the space S^3? remember,

S^1 surface of a 2 dimensional ball,

S^2 surface of a 3 dimensional ball,

S^3 surface of a 4 dimensional ball,

S^4 surface of a 5 dimensional ball.

Let us not forget time. In a closed big bang universe can time be thought of as a big circle if we identify beginning and end points? If so can spacetime of a closed universe be thought of as the surface of a 5 dimensional ball?

Thank you for any thoughts.

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# Is spacetime the surface of a 5 dimensional ball.

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